>>> on our broadcast tonight, the showdown, president obama, mitt romney and the debate in denver everyone is talking about. >>> breaking news about american airlines. why dozens of planes in the air tonight are being grounded when they land. >>> out of gas. why some gas stations are shutting down in a placehere prices are already over $5 a gallon. >>> is it a hidden danger in plastics and cans of high importance to mothers and their newborns. >>> and what we look like to them. "nightly news" begins now. to t. "nightly news" begins now. >>> good evening. they now estimate over 67 million of us watched the debate in denver last night and what people saw was a highly energized, motivated and combative mitt romney sharing the stage with a subdued and lackluster president obama. what they saw was mitt romney on his way over the course of 90 minutes to scoring a clear and consensus victory in what will be the first of three meetings between these two men. for romney, today felt like a new chapter. here's a look at the crowd waiting for him in virginia, while the president today said some things